Drawing Text With Attributes(Chapter 20 of Cocoa Programming for Mac OS X)

hyperv

1 #import "BigLetterView.h"
  2
  3
  4 @implementation BigLetterView
  5
  6 - (IBAction)savePDF:(id)sender
  7 {
  8     NSSavePanel *panel = [NSSavePanel savePanel];
  9     [panel setRequiredFileType:@"pdf"];
10     [panel beginSheetForDirectory:nil file:nil modalForWindow:[self window] modalDelegate:self didEndSelector:@selector(didEnd:returnCode:contextInfo:) contextInfo:NULL];
11 }
12
13 - (void)prepareAttributes
14 {
15     attributes = [[NSMutableDictionary alloc] init];
16     [attributes setObject:[NSFont fontWithName:@"Helvetica" size:75] forKey:NSFontAttributeName];
17     [attributes setObject:[NSColor redColor] forKey:NSForegroundColorAttributeName];
18 }
19
20 - (void)didEnd:(NSSavePanel    *)sheet returnCode:(int)code contextInfo:(void *)contextInfo
21 {
22     if(code != NSOKButton)
23     {
24         return;
25     }
26     
27     NSRect r = [self bounds];
28     NSData *data = [self dataWithPDFInsideRect:r];
29     NSString *path = [sheet filename];
30     NSError *error;
31     BOOL successful = [data writeToFile:path options:0 error:&error];
32     if (!successful)
33     {
34         NSAlert *a = [NSAlert alertWithError:error];
35         [a runModal];
36     }
37 }
38
39 - (id)initWithFrame:(NSRect)frameRect
40 {
41     if(![super initWithFrame:frameRect])
42     {
43         return nil;
44     }
45     
46     NSLog(@"initializing view");
47     [self prepareAttributes];
48     bgColor = [[NSColor yellowColor] retain];
49     string = @" ";
50     return self;
51 }
52
53 - (void)dealloc
54 {
55     [bgColor release];
56     [string release];
57     [attributes release];
58     [super dealloc];
59 }
60
61 - (void)drawRect:(NSRect)dirtyRect
62 {
63     NSRect bounds = [self bounds];
64     [bgColor set];
65     [NSBezierPath fillRect:bounds];
66     [self drawStringCenteredIn:bounds];
67     
68     if([[self window] firstResponder] == self)
69     {
70         [[NSColor keyboardFocusIndicatorColor] set];
71         [NSBezierPath setDefaultLineWidth:4.0];
72         [NSBezierPath strokeRect:bounds];
73     }
74 }
75
76 - (BOOL)isOpaque
77 {
78     return YES;
79 }
80
81 - (BOOL)acceptsFirstResponder
82 {
83     NSLog(@"Accepting");
84     return YES;
85 }
86
87 - (BOOL)resignFirstResponder
88 {
89     NSLog(@"Resigning");
90     [self setNeedsDisplay:YES];
91     return YES;
92 }
93
94 - (BOOL)becomeFirstResponder
95 {
96     NSLog(@"Becoming");
97     [self setNeedsDisplay:YES];
98     return YES;
99 }
100
101 - (void)keyDown:(NSEvent *)theEvent
102 {
103     [self interpretKeyEvents:[NSArray arrayWithObject:theEvent]];
104 }
105
106 - (void)insertText:(NSString *)input
107 {
108     [self setString:input];
109 }
110
111 - (void)insertTab:(id)sender
112 {
113     [[self window] selectKeyViewPrecedingView:self];
114 }
115
116 - (void)deleteBackward:(id)sender
117 {
118     [self setString:@" "];
119 }
120
121 #pragma mark Accessors
122
123 - (void)setBgColor:(NSColor *)c
124 {
125     [c retain];
126     [bgColor release];
127     bgColor = c;
128     [self setNeedsDisplay:YES];
129 }
130
131 - (NSColor *)bgColor
132 {
133     return bgColor;
134 }
135
136 - (void)drawStringCenteredIn:(NSRect)r
137 {
138     NSSize strSize = [string sizeWithAttributes:attributes];
139     NSPoint strOrigin;
140     strOrigin.x = r.origin.x + (r.size.width - strSize.width)/2;
141     strOrigin.y = r.origin.y + (r.size.height - strSize.height)/2;
142     [string drawAtPoint:strOrigin withAttributes:attributes];
143 }
144
145 - (void)setString:(NSString *)c
146 {
147     c = [c copy];
148     [string release];
149     string = c;
150     NSLog(@"The string is now %@", string);
151     [self setNeedsDisplay:YES];
152 }
153
154 - (NSString *)string
155 {
156     return string;
157 }
158
159 @end